Robohash is a easy web service that makes it easy to provide unique, robot/alien/monster/whatever images for any text.
Put in any text, such as IP address, email, filename, userid, or whatever else you like, and get back a pretty image for your site. https://robohash.org/

Verse is a RESTful API that checks the latest version of your favourite open source project and simplifies the whole process to one HTTP request. Just like that. https://verse.pawelad.xyz/

Adorable Avatars is an avatar placeholder service for web developers and designers. http://avatars.adorable.io/

Fake Online REST API for Testing and Prototyping http://jsonplaceholder.typicode.com

This is an instruction booklet that shows you how to build a text editor in C. http://viewsourcecode.org/snaptoken/kilo/

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Composercat is a comprehensive GUI for the Composer package manager, designed both for professionals and people taking their first steps with Composer. https://www.getcomposercat.com